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https://issues.apache.org/jira/browse/FLINK-5713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek closed FLINK-5713.
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Resolution: Duplicate
FLINK-5972 is the more general fix for this.
> Protect against NPE in WindowOperator window cleanup
> ----------------------------------------------------
>
> Key: FLINK-5713
> URL: https://issues.apache.org/jira/browse/FLINK-5713
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Fix For: 1.2.1
>
>
> Some (misbehaved) WindowAssigners can cause windows to be dropped from the
> merging window set while a cleanup timer is still active. This will trigger a
> NullPointerException when that timer fires.
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